Montana is a state located in the northwestern United States, bordered by North Dakota, South Dakota, Wyoming, Idaho, and Canada's British Columbia and Saskatchewan provinces. Its mountain ranges, prairies, and rolling hills cover an area of about 147,000 square miles, making it the fourth largest state in the US. Its largest cities are Billings, Missoula, and Great Falls. Montana is known for its vast landscape of rugged mountains and beautiful scenery, and is popular for activities such as skiing, hiking, rafting, and horseback riding.